PCU support

[bdunn313]

Add in all PCU-related endpoints to the go client

Example: Create a PCU Group

ctx := context.Background()
client, _ := astra.NewClientWithResponses("https://api.astra.datastax.com",
    astra.WithRequestEditorFn(func(ctx context.Context, req *http.Request) error {
        req.Header.Set("Authorization", "Bearer "+token)
        return nil
    }))

resp, _ := client.PcuCreateWithResponse(ctx, []astra.PCUGroupCreateRequest{{
    Title:         "Production PCU Group",
    Region:        "us-east-1",
    Reserved:      100,
    Min:           50,
    Max:           200,
    InstanceType:  "standard",
    ProvisionType: provisionTypePtr(astra.ProvisionTypeServerless),
}})

if resp.JSON201 != nil {
    pcuGroupUUID := (*resp.JSON201)[0].Uuid
    fmt.Printf("Created PCU Group: %s\n", *pcuGroupUUID)
}

Example: Get associations and add a new one

resp, _ := client.PcuAssociationGetWithResponse(ctx, "pcu-group-uuid")

if resp.JSON200 != nil {
    for _, assoc := range *resp.JSON200 {
        fmt.Printf("Datacenter: %s, Status: %s\n",
            *assoc.DatacenterUUID, *assoc.ProvisioningStatus)
    }
}

resp, _ := client.PcuAssociationCreateWithResponse(ctx,
    "pcu-group-uuid",
    "datacenter-uuid")

if resp.StatusCode() == 201 {
    fmt.Println("Database associated with PCU group")
}

[emerkle826]

For the most part, these look right, but I would change all the 5XX codes to 500 to be consistent in other places. It looks like auto-generating the client code causes some changes in some places, which will break anything that is using this client and was referencing those codes before.

[bdunn313]

Related: datastax/terraform-provider-astra#473

[bdunn313]

Talked this through multiple times in slack etc, addressed comments and tested within TF provider and standalone. Merging and closing.